The United States entered World War I in 1917 with only 26 trained pilots in its land-based air arm. One of them was Art Coyle, a 19-year-old N.H. National Guard lieutenant and son of a Concord granite cutter. Despite his humble origins, Coyle rose by the end of the war to command an American air observation group of three squadrons on the Western Front, the highest level of command achieved by a New Hampshire flyer. Yet Captain Arthur J. Coyle is largely unknown today. This talk will be informed by new research, including the speaker's recent access to Coyle's 1918 war diary.